.....but wouldn't the breast spots be more distinctive and blacker in Hermit thrush?
As such, I would have gone for Swainson's; however, the pale base to the lower mandible doesn't seem extensive enough, and seems to match........
Bicknell's thrush.
I remember a bird that turned up on Scilly, England in 1986 that was identified as Swainson's, then Gray-cheeked, then it turned out to be a Bicknell's - which of course is a kind of intermediate between the two. Depressingly, our national rarities committee has never accepted it as such.
Sean